Across
- 1. gasses around earth
- 4. the natural destruction of something
- 6. prevention of wasteful use of resources
- 7. warm blooded animals who do NOT lay eggs
- 8. work in a set way to reach a set goal
- 9. animals
- 10. when plants generate oxygen using sunlight, carbon dioxide and water
- 11. mushrooms, mould, yeast
Down
- 2. a community of organisms and their physical environment
- 3. chopping down a lot of trees
- 5. plants
- 8. a large number of plants harvested at one time